The cryptographic signature guarantees the file is safe to install and was not tampered
with in any way.

Ghost Commander is a dual-panel file manager (as well as a FTP, SFTP, SMB, WebDAV, Drive, BOX, Dropbox client!) which will let you to manage your files locally or remotely as well as tweak your system in the root mode.

This is an open source software (see tinyurl.com/gc-source) and does not show any advertisement! The project exists only because of your donations.

The main idea behind the user interface is classic: copy and move files from one panel to another. Simple.
Also, to not overload the display with extra checkboxes, file selection is made as follows: each file row is divided by two zones: tapping on the left you open files and folders, tapping on the right you select multiple items. If you are left handed, that could be swapped in the settings.

Writing access to external sdcard drives and USB OTG is provided through a special "Storage Access Framework" mode. Native mode can give only a read-only access to external drives.

Ghost Commander supports FTP and SFTP servers and Windows network shares, as well as Google Drive, BOX and Dropbox cloud storage (plugin required), plus it can create/extract ZIP archives and work with as it was a regular folder.
For advanced users, this file manager also supports root (superuser) mode, which is essential to work with protected system files on a rooted devices, like to change file permission attributes/owners (chmod/chown) and even execute your own shell commands (busybox required).

This file manager is very customizable and comes with a lot of options which allow you to adjust its appearance and behavior to your personal tastes and habits.

Requested permissions explanation:
INTERNET - to make FTP and other network plugins be able to connect to the servers.
No connection is established without your command to do so.
ACCESS_WIFI_STATE - to not to let the WiFi go down during a file transfer.
WAKE_LOCK - to not to let the phone go to a deep sleep during a file transfer.
WRITE_EXTERNAL_STORAGE - to let the file manager copy files to the sdcard.
VIBRATE - to let the phone vibrate when a long file operation is done.
INSTALL_SHORTCUT - to create shortcut icons to the desktop.
MOUNT_UNMOUNT_FILESYSTEMS - to do so when you have asked that.
ACCESS_SUPERUSER - to let the root: mode of the file manager functioning properly. Not used for any other purposes.
USE_CREDENTIALS - only to let the Google Drive plugin access to the Google based services.